My info is current to last week, but both Crawlers were in their parking spots just NW of the VAB. One MLP was in the VAB (High Bay 1 IIRC), one was at its park site just N of the VAB and the third was out at the Pad. I didn't take a photo so I can't recall whether it was at A or B. I *think* it was B, but don't quote me.

Not sure why its out there, but likely they are doing maintenance to either it or the Pad and require it out there.

As for the flight hardware, checkout the Shuttle Status Reports website has fairly up-to-date info:

"Aft buildup" has been in work for a couple of months now. Maybe someone else can shed light on what that refers to. I don't think that necessarily means they are stacking on the MLP yet. They may be working on the aft skirt or nozzle sections.

"Aft buildup" has been in work for a couple of months now. Maybe someone else can shed light on what that refers to. I don't think that necessarily means they are stacking on the MLP yet. They may be working on the aft skirt or nozzle sections.